A Louisiana judge granted an injunction Tuesday to block a study of a proposal to merge Southern University of New Orleans and the University of New Orleans, The Advocate reported. The injunction was sought in a suit by seven Southern students charging that the Louisiana Board of Regents in its current composition is unconstitutional, and thus lacks the authority to review the study that was under way until the injunction was issued. The lawsuit states that the board is required to represent the diversity of the state, but that all of the appointed members of the board are white. (Until recently there were some minority members, but the latest round of appointments replaced them.) Those bringing the suit, and many other supporters of Southern, a historically black institution, oppose the idea of a merger. Governor Bobby Jindal, a Republican, called for the study of the merger, citing low graduation rates at the two universities, but critics say that Southern has a valuable mission that would get lost in a combined institution.